Dave Chinner <david@xxxxxxxxxxxxx> writes: > How do other filesystems behave? Is this a problem just on specific > filesystems? I finally got around to testing other filesystems and surprisingly, it seems this is only a problem for ext4. I tried btrfs, f2fs, jfs, udf, and xfs. xfs even uses the same jbd2 for journaling that ext4 does doesn't it? I just formatted a clean fs, synced, and ran blktrace, then synced again, and only ext4 emits a flush on the second sync.
